The mother of Aaron Alexis, the 34-year-old gunman who is accused of killing 12 people before being killed himself at the Washington Navy Yard on Monday, spoke from her Brooklyn home Wednesday.Cathleen Alexis made a short statement saying her son's actions "have had a profound and everlasting affect on the families of the victims," NBC News reported.Mother of DC shooter Aaron Alexis: "I don't know why he did what he did and I will never be able to ask him ...